Stationary Aerosol Mask Testing Apparatus

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Solution Overview

Problem

Conventional methods for testing the filtration efficiency of face masks are complex, expensive, and inaccurate due to the need for sophisticated equipment to maintain precise airflow and particle concentration in moving aerosol systems, which do not accurately simulate real-world usage and fail to measure new masks effectively.

Innovation Solution

A system where a face mask or air-permeable sheet material is moved through a chamber containing a stationary aerosol, allowing for precise control of the mask's speed and simplified measurement of particle concentration, reducing the need for expensive equipment and improving accuracy by using a single particle counter and eliminating the need for complex airflow management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional methods use moving aerosol systems with sophisticated equipment to maintain precise airflow and particle concentration, then measurement capability is provided, but device complexity and cost increase significantly

Engineering Contradiction:

Improvefiltration efficiency measurementVSAvoidtesting equipment complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Instead of moving the aerosol through a stationary mask as in conventional systems, this invention moves the mask through a stationary aerosol chamber. This inversion eliminates the need for complex airflow generation and maintenance equipment, while still achieving accurate filtration efficiency measurements by maintaining relative motion between mask and particles

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention extracts the aerosol generation and airflow management components from the testing system. By using a stationary aerosol chamber without active airflow generation, the system removes complex equipment (compressors, pumps, flow meters) while retaining measurement capability through a single particle counter

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If conventional systems force aerosol through a stationary mask, then particle interception can be measured, but airflow velocity control and particle concentration maintenance become difficult and inaccurate

Engineering Contradiction:

Improveparticle concentration measurementVSAvoidairflow velocity control

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The system inverts the conventional approach by moving the mask holder through stationary aerosol rather than forcing aerosol through a stationary mask. This eliminates the difficulty of controlling airflow velocity and maintaining particle concentration, as the aerosol remains stationary and the mask moves at a controlled speed through it

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The stationary aerosol chamber naturally maintains particle concentration without requiring active control systems. The aerosol self-generates the testing environment, eliminating the need for complex airflow management and concentration control equipment

Inventive Principle:

Principle #25Self-service

3Reliability

If conventional protocols require sophisticated laboratory equipment including compressors, pumps, and flow meters, then airflow velocity can be maintained, but testing cost and system simplicity increase

Engineering Contradiction:

Improveairflow velocity maintenanceVSAvoidtesting system simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention removes compressors, pumps, flow meters, and other sophisticated laboratory equipment from the testing system. By using a stationary aerosol chamber and moving the mask through it, the system achieves reliable testing without complex airflow generation and control equipment

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system replaces expensive, complex equipment with simpler, more affordable components. A single particle counter and a straightforward moving mask holder system provide reliable measurements without the need for costly compressors, pumps, and flow control devices

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach results in a more accurate, cost-effective, and simpler method for testing face mask filtration efficiency, allowing immediate measurement of new masks without exposure to a steady stream of particles, with improved precision and reduced maintenance costs.

Implementation Method 1

E is evaluated by measuring the percentage of encountered moving particles that are intercepted by the mask or mask material

Methodology Applied

Scientific EffectInterception:

Implementation Method 2

measuring the particle concentration both upstream and downstream of the mask or material

Methodology Applied

Scientific EffectParticle detection:

Data Source

PatentUS11215548B1Method and apparatus for mask testing

Publication Date: 2022.01.04 BRANDT RICHARD A

AI summary

A face mask or a sample of air-permeable sheet material thereof is moved through a chamber containing a stationary particle-imbedded aerosol. A drive mechanism is preferably operatively connected to a mask holder or supporting shuttle for sliding the shuttle and the mask material along a linear path or a circular path. An aerosol supply and a photodetector are connected to a container that defines the chamber and communicate with the chamber.